I'm sorry for all the pain and stress you are going through right now. Please remember that your husband can send formally-worded, demanding emails until his fingers fall off, but it doesn't mean SQUAT legally. He has no power over you or this situation! He is trying to intimidate you into making choices that you believe are not best for you and your children, so PLEASE remain strong. Again, I'd advise that you do NOT answer his emails nor discuss the financials (if the two of you cannot agree) without your lawyer's involvement. Trust me...my husband REALLY put pressure on me (and in his line of business he knew just what to say to scare me), but I flat out refused to participate in the back and forth arguing. When we couldn't agree on matters or when I didn't know if what he was suggesting was the best choice for me, I went to my lawyer and let him handle it. My lawyer always made sure I was comfortable with the route he thought best for me to go before pursuing it, which I greatly appreciated. This is what the lawyers are paid for, and you have enough on your plate otherwise to worry about this. I would very calmly tell him that you will not discuss matters with him as long as he acts angry and irrational...PERIOD. Then turn the phone off, don't answer his emails and don't be bullied into seeing him.
Now more than ever you need to be strong...for yourself and for your children. Who is to say your husband won't have an awakening and change his behavior, but for now put your focus on the kids and you.